Subdomain Recon - Certificate Transparency Lookup

by GTS · cloudgeeks.com.au · Developer Tools

Established publisherManifest V3 Free

View in Chrome Web Store Data as of 17 Oct 2026

Enumerate subdomains for a domain from crt.sh Certificate Transparency logs. Right-click a domain to start.

Users

+2 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#168K

#140K among extensions

Version

1.0.4

updated 28 Apr 2026

Users

monthly, 6 months

Latest, 17 Oct 2026: 15 usersMove the mouse over the chart for any month

Ratings count

monthly, 6 months

Latest, 17 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Subdomain Recon - Certificate Transparency Lookup

Enumerate Subdomains From Certificate Transparency Type a domain or right-click any selected domain on a page. The extension queries crt.sh and returns the set of subdomains that have had TLS certificates issued. WHAT IT DOES - Queries crt.sh for certificates matching the given domain - Deduplicates subdomains across CT entries - Displays up to 500 subdomains, alphabetically sorted - Copies the whole list to the clipboard on one click - Prefills with the current tab's hostname - Adds a right-click context menu entry on any selected text that looks like a domain HOW IT WORKS 1. Install the extension 2. Type a domain in the popup, or right-click a domain on a page 3. See the list of subdomains PRIVACY Only the root domain is sent to crt.sh when you click Lookup. Page content is never read. No telemetry. SUPPORT Email: support@cchk.info Privacy policy: https://extensions.cchk.info/subdomain-recon/privacy Built by Cloud Geeks, a division of Ganda Tech Services.